Replaced NULL with nullptr.
Replaced NULL with nullptr.

AscEmu/AscEmu,Appled/AscEmu,AscEmu/AscEmu,master312/AscEmu,Appled/AscEmu,AscEmu/AscEmu,master312/AscEmu,master312/AscEmu,Appled/AscEmu,master312/AscEmu,master312/AscEmu,master312/AscEmu